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S=n(a1+an)/2 gives the partial sum of an arithmetic sequence. What is the formula solved for an?
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S=n(a1+an)/2 gives the partial sum of an arithmetic sequence. What is the formula solved for an?

User Kinaan Khan Sherwani
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2 Answers

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Just took the quiz.

The answer is an=2S-a1n/n

User The Integrator
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S = n(a1 + an)/2
2S = n(a1 + an)
2S = na1 + nan
nan = 2S - na1
an = (2S - n a1)/n
User Enigo
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